@article{SLC_1984_10_a12,
     author = {Robert Cori and Dominique Perrin},
     title = {Mono{\"\i}des partiellement commutatifs},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1984},
     volume = {10},
     url = {http://geodesic.mathdoc.fr/item/SLC_1984_10_a12/}
}